1. Check the battery connections: Ensure that the battery connections are clean and tight. Any loose or corroded connections can prevent the battery from delivering power to the starter.
2. Reset the computer: Disconnecting the battery can reset the car's computer. Try reconnecting the battery and turning the key to the "On" position without starting the engine. Leave it like that for a few minutes, then turn the key off and try starting the car again.
3. Check the starter: If resetting the computer doesn't work, the starter motor itself may be the issue. Try tapping the starter with a hammer or metal object while someone else is turning the key to start the car. If the starter engages and the engine starts, you may need to replace the starter.
4. Check the fuel system: Ensure that the fuel lines are not kinked or blocked and that the fuel filter is not clogged. You may also try starting the car with the gas pedal pressed all the way down to the floor. This can help if there is an issue with fuel delivery.
If none of these steps work, you may need to have your car towed to a mechanic for further diagnosis and repair.